STEM beam channeling in BaSnO3/LaAlO3 perovskite bilayers and visualization of 2D misfit dislocation network

Hwanhui Yun; Abhinav Prakash; Bharat Jalan; Jong Seok Jeong; K. Andre Mkhoyan

doi:10.1016/j.ultramic.2019.112863

STEM beam channeling in BaSnO₃/LaAlO₃ perovskite bilayers and visualization of 2D misfit dislocation network

Hwanhui Yun, Abhinav Prakash, Bharat Jalan, Jong Seok Jeong, K. Andre Mkhoyan

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

A study of the STEM probe channeling in a heterostructured crystalline bilayer specimens is presented here with a goal to guide STEM-based characterization of multilayer structures. STEM analysis of perovskite BaSnO₃/LaAlO₃ bilayers is performed and the dominating effects of beam channeling on HAADF- and LAADF-STEM are illustrated. To study the electron beam channeling through BaSnO₃/LaAlO₃ bilayers, probe intensity depth profiles are calculated, and the effects of probe defocus and atomic column alignment are discussed. Characteristics of the beam channeling are correlated to resulting ADF-STEM images, which is then tested by comparing focal series of plan-view HAADF-STEM images to those recorded experimentally. Additionally, discussions on how to visualize the misfit dislocation network at the BaSnO₃/LaAlO₃ interface using HAADF- and LAADF-STEM images are provided.

Original language	English (US)
Article number	112863
Journal	Ultramicroscopy
Volume	208
DOIs	https://doi.org/10.1016/j.ultramic.2019.112863
State	Published - Jan 2020

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Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

BaSnO
Channeling
Focal series
HAADF
Heterostructure
LAADF
LaAlO
Multislice
STEM

How much support was provided by MRSEC?

Partial

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PubMed: MeSH publication types

Journal Article

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10.1016/j.ultramic.2019.112863

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@article{4c359fa7a99547c382076d994f7ef836,

title = "STEM beam channeling in BaSnO3/LaAlO3 perovskite bilayers and visualization of 2D misfit dislocation network",

abstract = "A study of the STEM probe channeling in a heterostructured crystalline bilayer specimens is presented here with a goal to guide STEM-based characterization of multilayer structures. STEM analysis of perovskite BaSnO3/LaAlO3 bilayers is performed and the dominating effects of beam channeling on HAADF- and LAADF-STEM are illustrated. To study the electron beam channeling through BaSnO3/LaAlO3 bilayers, probe intensity depth profiles are calculated, and the effects of probe defocus and atomic column alignment are discussed. Characteristics of the beam channeling are correlated to resulting ADF-STEM images, which is then tested by comparing focal series of plan-view HAADF-STEM images to those recorded experimentally. Additionally, discussions on how to visualize the misfit dislocation network at the BaSnO3/LaAlO3 interface using HAADF- and LAADF-STEM images are provided.",

keywords = "BaSnO, Channeling, Focal series, HAADF, Heterostructure, LAADF, LaAlO, Multislice, STEM",

author = "Hwanhui Yun and Abhinav Prakash and Bharat Jalan and Jeong, {Jong Seok} and Mkhoyan, {K. Andre}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2020",

month = jan,

doi = "10.1016/j.ultramic.2019.112863",

language = "English (US)",

volume = "208",

journal = "Ultramicroscopy",

issn = "0304-3991",

publisher = "Elsevier",

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AU - Yun, Hwanhui

AU - Prakash, Abhinav

AU - Jalan, Bharat

AU - Jeong, Jong Seok

AU - Mkhoyan, K. Andre

PY - 2020/1

Y1 - 2020/1

N2 - A study of the STEM probe channeling in a heterostructured crystalline bilayer specimens is presented here with a goal to guide STEM-based characterization of multilayer structures. STEM analysis of perovskite BaSnO3/LaAlO3 bilayers is performed and the dominating effects of beam channeling on HAADF- and LAADF-STEM are illustrated. To study the electron beam channeling through BaSnO3/LaAlO3 bilayers, probe intensity depth profiles are calculated, and the effects of probe defocus and atomic column alignment are discussed. Characteristics of the beam channeling are correlated to resulting ADF-STEM images, which is then tested by comparing focal series of plan-view HAADF-STEM images to those recorded experimentally. Additionally, discussions on how to visualize the misfit dislocation network at the BaSnO3/LaAlO3 interface using HAADF- and LAADF-STEM images are provided.

AB - A study of the STEM probe channeling in a heterostructured crystalline bilayer specimens is presented here with a goal to guide STEM-based characterization of multilayer structures. STEM analysis of perovskite BaSnO3/LaAlO3 bilayers is performed and the dominating effects of beam channeling on HAADF- and LAADF-STEM are illustrated. To study the electron beam channeling through BaSnO3/LaAlO3 bilayers, probe intensity depth profiles are calculated, and the effects of probe defocus and atomic column alignment are discussed. Characteristics of the beam channeling are correlated to resulting ADF-STEM images, which is then tested by comparing focal series of plan-view HAADF-STEM images to those recorded experimentally. Additionally, discussions on how to visualize the misfit dislocation network at the BaSnO3/LaAlO3 interface using HAADF- and LAADF-STEM images are provided.

KW - BaSnO

KW - Channeling

KW - Focal series

KW - HAADF

KW - Heterostructure

KW - LAADF

KW - LaAlO

KW - Multislice

KW - STEM

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SN - 0304-3991

VL - 208

JO - Ultramicroscopy

JF - Ultramicroscopy

M1 - 112863

ER -

STEM beam channeling in BaSnO₃/LaAlO₃ perovskite bilayers and visualization of 2D misfit dislocation network

Abstract

Bibliographical note

Keywords

How much support was provided by MRSEC?

Reporting period for MRSEC

PubMed: MeSH publication types

Access

OpenUrl availability

Other files and links

Fingerprint

MRSEC IRG-1: Electrostatic Control of Materials

MRSEC IRG-2: Sustainable Nanocrystal Materials

MRSEC Program

Cite this

STEM beam channeling in BaSnO3/LaAlO3 perovskite bilayers and visualization of 2D misfit dislocation network

Abstract

Bibliographical note

Keywords

How much support was provided by MRSEC?

Reporting period for MRSEC

PubMed: MeSH publication types

Access

OpenUrl availability

Other files and links

Fingerprint

Projects

MRSEC IRG-1: Electrostatic Control of Materials

MRSEC IRG-2: Sustainable Nanocrystal Materials

MRSEC Program

Cite this

STEM beam channeling in BaSnO₃/LaAlO₃ perovskite bilayers and visualization of 2D misfit dislocation network